* Astronomy

Blobrana · L

RE: IC 4406

Blobrana · L

Title: IC 4406: a radio-infrared view
Authors: L. Cerrigone (1 and 2), J. L. Hora (1), G. Umana (3), C. Trigilio (3) ((1) Harvard-Smithsonian Center for Astrophysics, Cambridge, USA; (2) University of Catania, Catania, Italy; (3) INAF-Catania Astrophysical Observatory, Catania, Italy)

IC 4406 is a large (about 100'' x 30'') southern bipolar planetary nebula, composed of two elongated lobes extending from a bright central region, where there is evidence for the presence of a large torus of gas and dust. We show new observations of this source performed with IRAC (Spitzer Space Telescope) and the Australia Telescope Compact Array. The radio maps show that the flux from the ionised gas is concentrated in the bright central region and originates in an intricate structure previously observed in Halpha, while in the infrared images filaments and clumps can be seen in the extended nebular envelope, the central region showing toroidal emission. Modelling of the infrared emission leads to the conclusion that several dust components are present in the nebula.
Read more (1604kb, PDF)

Blobrana · L

Title: IC 4406: a radio-infrared comparison
Authors: L. Cerrigone (1,2), J. L. Hora (1), G. Umana (2), C. Trigilio (2), ((1) Harvard-Smithsonian Centre for Astrophysics, Cambridge, MA, USA, (2) INAF-Catania Astrophysical Observatory, Catania, Italy)

IC 4406 is a large (about 100'' x 30'') southern bipolar planetary nebula, composed by two elongated lobes, extending from a bright central region, where there is evidence for the presence of a large torus of gas and dust. In this poster we show new observations of this source performed with IRAC (Spitzer Space Telescope) and the Australia Telescope Compact Array. Although the possibility for faint extended emission to be missing in the radio maps cannot be ruled out, flux from the ionised gas appears to be concentrated in the bright central region. Comparing ATCA to IRAC images, it seems that, like in other planetary nebulae, ionised and neutral components spatially co-exist in IC 4406.

Read more (1604kb, PDF)